| diffya | Compute year-over-year difference for annual data |
| even | return even elements of a vector |
| f_comma | Format numeric vector in comma format |
| f_dollar | Format numeric vector in dollar format |
| fdoq | First day of quarter, given a date as string or date |
| f_pct | Format numeric vector as percent |
| fton | Factor to numeric |
| ht | Show head and tail of a vector, matrix, table, data frame or... |
| is.even | which elements of a vector are even |
| is.odd | which elements of a vector are odd |
| is.true | function to deal with NA logical values |
| lcnames | Convert names of a data frame to lower case |
| ldom | Last day of month |
| ma | Get trailing moving average |
| ma4 | Get 4-period moving average (3 lags + current) |
| memory | Describe memory usage and collect garbage |
| naz | Convert NA to zero |
| ns | create vector of sorted names of a data frame |
| odd | return odd elements of a vector |
| p25 | Compute the sample 25th percentile |
| p50 | Compute the sample 50th percentile (median). |
| p75 | Compute the sample 75th percentile. |
| pany | Compute the sample value for a specific percentile, p. |
| pchya | Compute year-over-year percent change for annual data |
| pipe | Pipe operator |
| pmean | Vectorized mean, similiar to 'pmin' and 'pmax' |
| psum | Vectorized sum, similiar to 'pmin' and 'pmax' |
| qtiledf | Get quantiles and number of not-NA observations for a vector,... |
| rollmean | Rolling mean |
| rollmin | Rolling minimum |
| rollsd | Rolling sample standard deviation |
| rollsd_p | Rolling populatoin standard deviation |
| sa | Get seasonally adjusted values for a vector |
| safe.ifelse | ifelse that can be used safely with dates |
| setdiff_all | which elements are not in the intersection of two vectors? |
| stabbr | get postal abbreviations given state names |
| stldf | Get trend, seasonal, remainder for a vector that has... |
| stname | get state names given postal abbreviations |
| str_detect_any | Detect whether any vector elements are in a string |
| str_extract_after_last | Return portion of a string after last occurrence of a pattern |
| str_extract_before_first | Return portion of a string before first occurrence of a... |
| sum4 | Get 4-period moving sum (3 lags + current) |
| xldate | Convert Excel numeric date to date. |
| yq2 | First day of quarter, from year, quarter |
